Sir Herbert Nigel Gresley (19 June 1876 – 5 April 1941)[1] was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer (CME) of the London and North Eastern Railway (LNER). He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A44-6-2Pacific engines. An A1 pacific, Flying Scotsman, was the first steam locomotive officially recorded over 100 mph in passenger service, and an A4, number 4468 Mallard, still holds the record for being the fastest steam locomotive in the world (126 mph).

Gresley's engines were considered elegant, both aesthetically and mechanically. His invention of a three-cylinder design with only two sets of Walschaerts valve gear, the Gresley conjugated valve gear, produced smooth running and power at lower cost than would have been achieved with a more conventional three sets of Walschaerts gear.

This rapid rise in his career was maintained for, in 1904, he became Assistant Superintendent of the Carriage and Wagon Department of the L&YR. A year later, he moved to the Great Northern Railway (GNR) as Carriage and Wagon Superintendent. He succeeded Henry A. Ivatt as CME of the GNR on 1 October 1911. At the 1923 Grouping, he was appointed CME of the newly formed LNER (the post had originally been offered to the ageing John G. Robinson; Robinson declined and suggested the much younger Gresley). In 1936, Gresley was awarded an honorary DSc by Manchester University and a knighthood by King Edward VIII;[3] also in that year he presided over the IMechE.

During the 1930s, Sir Nigel Gresley lived at Salisbury Hall, near St. Albans in Hertfordshire. Gresley developed an interest in breeding wild birds and ducks in the moat; intriguingly, among the species were Mallard ducks.[4] The Hall still exists today as a private residence and is adjacent to the de Havilland Aircraft Heritage Centre, with its links to the design of the famous Mosquito aircraft during World War II.

A memorial plaque to Gresley's achievements was unveiled at Edinburgh Waverley railway station in 2001. It was created by the Gresley Society and incorporates line drawings of his "Flying Scotsman" and "Mallard" locomotives.

The articulated railway carriage, first used with some conversions of East Coast Joint Stock (ECJS) carriages in 1907, soon followed by conversions of GNR carriages; new articulated carriages being built for the GNR from 1911.[5]